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Flashcards in Cabin Atmosphere Deck (25):

Describe the operating principle of a continuous flow oxygen system

High pressure oxygen flows from the
cylinder to the regulator where pressure is reduced and then to the mask outlets whenever the system is turned on


Describe the operating principle of a pressure demand oxygen system

oxygen flows from the cylinder to the regulator and then to the mask when the user inhales.


What should be used to purge an oxygen system of moisture

Oxygen, dry air, or dry nitrogen


What action must be taken when an oxygen system has been open to the atmosphere

Purge of any moisture


Name two different types of independent cabin air compressor

Positive displacement and centrifugal compressor


What is the source of pressurization air in most jet aircraft

Engine bleed air


What device provides the principle means of a controlling element in a cabin pressurized system

Outflow valve


What unit regulates the position of an outflow valve

Cabin pressure controller


Name several methods used on reciprocating engine aircraft for providing heated cabin air

Exhaust shroud heat exchangers, combustion heaters and electric heaters


What are the sources of ventilating air in a combustion heater

Ram air, cooling fans on the ground, or a compressor if the airplane is pressurized


Name the basic components of an air-cycle cooling system

The compressor and expansion turbine, heat exchangers, and various valves


Describe the basic operating principle that allows an air-cycle system to produce cool air

Hot engine bleed air is cooled in the primary heat exchanger and compressed and cooled again in the secondary heat exchanger. Then the air is expanded across the turbine where energy is extracted and pressure is reduced and produces a rapid temperature drop


Name the principle components of a vapor cycle system

A compressor, condenser, expansion valve and an evaporator


Describe the basic operating principles of a water separator

Cool, moist air is swirled so that water droplets are separated by centrifugal force


In what significant way way is a vapor cycle cooling system different from an air cycle system

Vapor cycle system uses Freon


Why is oil added to the refrigerant in a vapor cycle air conditioning system

Lubricate the compressor


What method is used by turbine powered aircraft for pressurization

Bleed air and engine compressor


What is the function of ventilating air in a combustion heater

Used to carry the heat to the places where it is needed


How are high and low pressure oxygen cylinder identified

High pressure oxygen cylinders are green and have AVIATORS BREATHING OXYGEN wrote on the cylinder and All low pressure oxygen cylinders are painted light yellow


How can you tell that there is carbon monoxide on the aircraft cabin

Crystals in the detector will change color


Where does the fuel used in an aircraft combustion heater come from

Aircraft fuel tanks


What maintenance is required for a combustion heater

Clean the fuel filters and check for fuel leaks


What are two types of air conditioning systems that may be installed on an aircraft

Air-cycle and Vapor-cycle


Is there any special requirement as to the type of oxygen used in an aircraft system and if so what is it

Only aviators breathing oxygen


Oxygen cylinders should have what on them

A DOT or ICC rating stamped on the bottle neck, the word AVIATION BREATHING OXYGEN and the last hydrostatic test must be stamped in the filler neck